Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-06-10
Phys.Lett. B387 (1996) 535-543
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, Latex2.09, including 7 Postscript figures, uses rotating.sty, complete psfile also available at ftp://ftp.physik.u
Scientific paper
10.1016/0370-2693(96)01058-1
Assuming that no supersymmetric signature will be found at the upgraded LEP collider we derive lower bounds on the masses of the four neutralinos $\tilde{\chi}_i^0$ in the Minimal Supersymmetric Standard Model (MSSM). We consider the recently published results from the search for the light chargino $\tilde{\chi}^\pm_1$ and the next-to-lightest neutralino $\tilde{\chi}^0_2$ at LEP1.5 and study the consequences of possible future lower $\tilde{\chi}^\pm_1$ and $\tilde{\chi}^0_2$ mass limits between 65 and 95 GeV. For a chargino mass bound of 66.8 GeV at LEP1.5, a massless neutralino is not excluded for $\tan\beta < 1.2$. If either $\tan\beta > 2.3$ or the gluino mass $m_{\tilde{g}} > 160$ GeV, we find $m_{\tilde{\chi}_1^0} > 28$ GeV. A possible chargino bound $m_{\tilde{\chi}_1^\pm} > 95$ GeV at LEP2 would raise this bound to 31 GeV (for all $\tan\beta$) or 44 GeV ($\tan\beta > 2$).
Franke F.
Hesselbach Stefan
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